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DTC U1004 Lost Communication with Engine Gateway Module: Description

If 2 or more DTCs are output during the DTC check, one side of the CAN branch wire may be open. (One side of the CANH [branch wire]/CANL [branch wire] of the ECU and/or sensor is open.)

PROBLEM SYMPTOM CHART

DTC Code Symptom Trouble Area
U1004 Lost communication with engine gateway module
  • Braking and driving bus circuit
  • ECM branch wire or connector
  • Skid control ECU branch wire or connector
  • Driving support ECU branch wire or connector
  • Suspension control ECU branch wire or connector
  • Steering control ECU branch wire or connector
  • Parking assist ECU branch wire or connector
  • Clearance warning ECU branch wire or connector
  • Electric parking brake ECU main wire or connector
  • Power steering ECU main wire or connector
  • Electric parking brake ECU Power steering ECU
  • ECM
  • Skid control ECU
  • Driving support ECU*1
  • Suspension control ECU*2
  • Steering control ECU*3
  • Parking assist ECU*4
  • Clearance warning ECU*5
  • No. 6 junction connector
  • No. 7 junction connector
HINT:
*1: w/ Dynamic Radar Cruise Control System or Pre-collision System
*2: w/ Air Suspension System
*3: w/ Variable Gear Ratio Steering System
*4: w/ Advanced Parking Guidance System and Intuitive Parking Assist System
*5: w/ Intuitive Parking Assist System
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